MXToolbox alternatives for checking SPF, DKIM and DMARC

AdminKit is built by Netbase JSC. AdminKit is listed below; the other tools (including MxToolbox) are independent.

Why someone looks for an MxToolbox alternative for this specific job

MxToolbox’s SPF, DMARC and DKIM tools are free, reliable and run with no stated account requirement — there’s nothing broken about them. People searching for an alternative to just that part of MxToolbox are usually after one of two things: a single page that already combines SPF, DKIM and DMARC into one report instead of three separate tool pages, or a dedicated DMARC-management vendor for an ongoing rollout rather than a one-off lookup. This page ranks six alternatives against MxToolbox’s own SPF/DKIM/DMARC tools as the baseline, scoped to that specific job — not to MxToolbox’s blacklist monitoring, which AdminKit’s direct MxToolbox comparison and the broader DNS/email-deliverability roundup both cover separately.

The ranked alternatives

1. DNSChecker. Based on dnschecker.org’s own indexed pages, read 2026-10-26 (every direct automated fetch returned HTTP 403 at verification time — see the note below), DNSChecker has dedicated free SPF, DKIM and DMARC checkers, with no login required for any of them. It goes further than MxToolbox’s three separate tool pages with an Email Verifier that checks six authentication signals — SPF, DKIM, DMARC, MTA-STS, TLS-RPT and BIMI — in a single pass. Its own pages don’t mention a paid DMARC-management platform or public API, so it ranks ahead of MxToolbox for this specific job (SPF/DKIM/DMARC checking) while still behind it for blacklist breadth and monitoring, which are out of scope here.

2. AdminKit. AdminKit’s SPF check, DMARC check and DKIM check are all free, live today, and run with no account, matching MxToolbox’s SPF/DKIM/DMARC coverage one-for-one. They sit alongside AdminKit’s DNS, MX, WHOIS and reverse-DNS tools on the same site, though not yet combined into a single multi-signal report the way DNSChecker’s Email Verifier is. AdminKit has no paid DMARC-rollout platform or public API today, which is why DNSChecker’s combined Email Verifier edges it out for this narrow use case.

3. EasyDMARC. Per easydmarc.com, read 2026-10-26, EasyDMARC runs free SPF, DKIM and DMARC checkers (plus BIMI, a DNS Record Checker and a Domain Scanner) with no account stated as required for a single check — only its 14-day free trial gates the paid platform. Its DMARC XML Report Analyzer is a real step toward ongoing rollout management, which is why EasyDMARC is a stronger choice than DNSChecker or AdminKit specifically for a team about to start enforcing DMARC at scale, even though it’s narrower than either on general-purpose DNS/MX tooling.

4. dmarcian. The co-creator of the DMARC standard offers free SPF Surveyor, DMARC Inspector and DKIM Inspector/Validator tools per dmarcian.com, read 2026-10-26, each checking the record directly with no account required. Its real differentiator for this audience is reputation and professional services (deployment, onboarding, consultation) behind a 30-day trial of its DMARC Management Platform — a reasonable alternative for a team that wants vendor support during a DMARC rollout, not just a free lookup.

5. mail-tester. Per its own SPF & DKIM Checker and DMARC Checker pages, read 2026-10-26, both read a domain’s records directly and are free, with no test email required to use them. mail-tester also publishes API documentation for automation. It ranks behind the dedicated checkers above because its headline product — scoring an actual outgoing email for spam-filter risk — is a different job from a quick SPF/DKIM/DMARC record lookup, even though the record-checker tools exist and work for that narrower need too.

6. Google Admin Toolbox. Per its own Check MX page, read 2026-10-26, Google’s free, no-account tool validates “MX and SPF Records” — covering SPF, but with no dedicated DKIM or DMARC checker found on Google’s own pages. It’s a reasonable quick substitute for the SPF half of MxToolbox’s tools if you’re already inside Google’s admin toolbox for another reason, but it’s the weakest full replacement for “check my SPF, DKIM and DMARC” of the six alternatives here.

A transparency note on DNSChecker

Every automated fetch of dnschecker.org’s own pages for this comparison returned an HTTP 403 (blocked) at verification time (2026-10-26). The facts above about DNSChecker’s SPF, DKIM, DMARC and Email Verifier tools come from that domain’s own publicly indexed page titles, descriptions and specific tool-page URLs, each linked directly so it can be checked by visiting dnschecker.org. AdminKit’s DNSChecker vs MxToolbox comparison uses the same sourcing approach and explains it in more detail.

Best for your specific situation

• Want one page instead of three MxToolbox tabs: DNSChecker’s Email Verifier or AdminKit’s combined SPF/DKIM/DMARC/DNS report.
• Starting a DMARC rollout and want vendor support: EasyDMARC or dmarcian, both of which sell a dedicated platform behind their free checkers.
• Need to automate a check into a script or pipeline: mail-tester, the only one of these six with published API documentation.
• Already inside Google Workspace admin tooling for another reason: Google Admin Toolbox’s Check MX, for a quick SPF/MX read.

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Trademarks belong to their respective owners; AdminKit is not affiliated with MxToolbox, Inc., DNSChecker, EasyDMARC, dmarcian, Google or mail-tester.